[libc] Move libc_errno inside of LIBC_NAMESPACE (#80774)

Having libc_errno outside of the namespace causes versioning issues when
trying to link the tests against LLVM-libc. Most of this patch is j

[libc] Move libc_errno inside of LIBC_NAMESPACE (#80774)

Having libc_errno outside of the namespace causes versioning issues when
trying to link the tests against LLVM-libc. Most of this patch is just
moving libc_errno inside the namespace in tests. This isn't necessary in
the function implementations since those are already inside the
namespace.

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[libc] Update libc_errno to work correctly in both overlay and full build modes. (#80177)

[libc] Mass replace enclosing namespace (#67032)

This is step 4 of
https://discourse.llvm.org/t/rfc-customizable-namespace-to-allow-testing-the-libc-when-the-system-libc-is-also-llvms-libc/73079

[libc] Make ErrnoSetterMatcher handle logging floating point values.

Along the way, couple of additional things have been done:

1. Move `ErrnoSetterMatcher.h` to `test/UnitTest` as all other matche

[libc] Make ErrnoSetterMatcher handle logging floating point values.

Along the way, couple of additional things have been done:

1. Move `ErrnoSetterMatcher.h` to `test/UnitTest` as all other matchers live
there now.
2. `ErrnoSetterMatcher` ignores matching `errno` on GPUs.

Reviewed By: jhuber6

Differential Revision: https://reviews.llvm.org/D151129

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[libc][NFC] Switch mman.h tests to libc_errno and update Bazel build.

[libc][NFC] Move UnitTest and IntegrationTest to the 'test' directory.

This part of the effort to make all test related pieces into the `test`
directory. This helps is excluding test related pieces

[libc][NFC] Move UnitTest and IntegrationTest to the 'test' directory.

This part of the effort to make all test related pieces into the `test`
directory. This helps is excluding test related pieces in a straight
forward manner if LLVM_INCLUDE_TESTS is OFF. Future patches will also move
the MPFR wrapper and testutils into the 'test' directory.

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[libc][NFC] Move sys/mman entrypoints to the default build configs.

Specifically, mmap and munmap have been moved to the default build list
of entrypoints. To support this, certain deps and includes

[libc][NFC] Move sys/mman entrypoints to the default build configs.

Specifically, mmap and munmap have been moved to the default build list
of entrypoints. To support this, certain deps and includes have been
adjusted. The use of errno in some cases has been updated.

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[libc][NFC] add "LlvmLibc" as a prefix to all test names

Summary:
Having a consistent prefix makes selecting all of the llvm libc tests
easier on any platform that is also using the gtest framework.

[libc][NFC] add "LlvmLibc" as a prefix to all test names

Summary:
Having a consistent prefix makes selecting all of the llvm libc tests
easier on any platform that is also using the gtest framework.
This also modifies the TEST and TEST_F macros to enforce this change
moving forward.

Reviewers: sivachandra

Subscribers:

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[libc][obvious] Move ErrnoSetterMatcher to test/ErrnoSetterMetcher.h.

[libc][NFC] Make all top of file comments consistent.

Summary:
Made all header files consistent based of this documentation: https://llvm.org/docs/CodingStandards.html#file-headers.
And did the same

[libc][NFC] Make all top of file comments consistent.

Summary:
Made all header files consistent based of this documentation: https://llvm.org/docs/CodingStandards.html#file-headers.
And did the same for all source files top of file comments.

Reviewers: sivachandra, abrachet

Reviewed By: sivachandra, abrachet

Subscribers: MaskRay, tschuett, libc-commits

Tags: #libc-project

Differential Revision: https://reviews.llvm.org/D77533

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[libc] [NFC] Use matchers in tests

Summary:
Use `EXPECT_THAT` where possible in tests NFC intended.

Added a `void *` template instantiation of `StreamWrapper::operator<<`

Reviewers: sivachandra, P

[libc] [NFC] Use matchers in tests

Summary:
Use `EXPECT_THAT` where possible in tests NFC intended.

Added a `void *` template instantiation of `StreamWrapper::operator<<`

Reviewers: sivachandra, PaulkaToast

Reviewed By: sivachandra

Subscribers: MaskRay, tschuett, libc-commits

Differential Revision: https://reviews.llvm.org/D75717

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[libc] Move the implementation of mmap and munmap into a linux specific area.

This allows us to get rid of the PAGE_SIZE macro and use EXEC_PAGESIZE
from linux/param.h.

Few other points about this

[libc] Move the implementation of mmap and munmap into a linux specific area.

This allows us to get rid of the PAGE_SIZE macro and use EXEC_PAGESIZE
from linux/param.h.

Few other points about this change:
1. The linux syscall functions have been moved into a linux specific area
instead of src/unistd/syscall.h. The Linux syscall function from unistd.h
is a public vararg function. What we have currently are linux speciif internal
overloaded C++ functions. So, moving them to a Linux only area is more
meaningful.
2. The implementations of mmap and munmap are now in a 'linux' directory
within src/sys/mman. The idea here is that platform specific
implementations will live in a platform specific subdirectories like these.
Infrastructure common to a platform will live in the platform's config
directory. For example, the linux syscall implementations live in
config/linux.

Reviewers: abrachet

Tags: #libc-project

Differential Revision: https://reviews.llvm.org/D73302

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